roulstone



@uiten tatie @anni @frn yIll/llli,OVElllllllilIf IN LOCKS;

Be it known that I, Ei A. G.RonLsTONE, of Roxbury, in the county ofNorfolk, and State of Massachusetts, l,

have invented an Improvement in Locks ,and I do hereby declare that'thefollowing, taken in conneton with the drawings which accompany and formpart of this specification, is a descriptionof my` invention sulicient,i l

to enable those skilled in the art to practise it, a

The improvement relates generally to tlleconstrnction or arrangement of"partsof spring loelis for trunks.

but more particularly to the construction and method of operation of a'sliding spring, hasp, or bolt.

The drawings represent, at A, a front view of the lock, showing themechanism in dotted lines, the haspfor` i bolt being locked. B shows theposition of the parts when unlocked.' a denotes the back plate ofthelock, which is applied to the front of Y the trunk the outer platethereof, the locking mechanism being contained between them. c is theinner and d the outer plate, between which the hasp e slides. To theplate a, a series of'` tnmblers or levers, f, are hung. Two setsof themare shown, their ends operated upon by the key, interlocking so that byturning the key these ends shall be simultaneously elevated to throw`outward the hooks or spring i latches, g, on the upper ends of thetumblers. The tumblers a-re held normally in position byspringsA hpas` iseenat A. The hasp or bolte, whichslides between the plates c d, has twoprojecting latches z', at its lower` end, with inclines c, and at itsupper end lateral projections ZL The bolt slides between ways or guideson eah` side of it as seen at A, and the extent of itsy downwardmovement is limited by` one or more projections l,

striking stops m, in the plated. In yits upward movement the latches orprojections t', strike the bottom of the` plate d, or the extent of itsupward movement may be limited by the bottom ofa slot r in the boltstrikinga i projection n from the plate d. In'this slot, and a .counterslot in the plate d, is a spring o, one end abutting against the plateprojection n, and the other against a projection p, from the bolt. Thisspring holdsthe bolt normally out of the lock, or away from the lockingmechanism as seen at B, in which position the lid of the trunk or chestto which the lock is applied is raised and lowered without being locked.If, however, `the hand be applied to the head g of the bolt, (which whenthe trunk is unlocked projects from the bolt case as seen at` i 13,) andthe bblt pushedV .downwards the inclines c press back the tumblerlatches until the projections z' slip by them, when the tumbler springswill press the latches up over the projections z', and the trunk will besecurely locked. If now the ky be applied, and the tumbler latchesthrownback, the bolt will be thrown up bythe action of its spring o, andthe trunk will be unlocked. The bolt c may have `the projection 'i onlyon one side 1 of it, in which case only one set of tumblers will berequired, but I prefer the construction shown. It will `be readilyunderstood that the spring bolt, locked by being pressed 4into position,and dying from the tumblersor locking mechanism upon turning thekey,-may be applied to mortise 4and other door` locks, As a trunklock,`it is very serviceable and strong, simple in its construction, andof a very convenient and desirable form, being much superior to thecommon swinging hasp lock, or to the ordinary spring locks.

I claim the bolt e,- constructed to operate'in connection with a lockingmechanism, substantially as set forth.` i i y E. A. G. ROULSTONE.

Witnesses:

J. B. CROSBY, F. Gouw.

